[R] aggredating date data

analyst41 at hotmail.com analyst41 at hotmail.com
Wed Jan 12 21:20:41 CET 2011

I tried a date by date forecast of a time series and it seems to be
too wild.  How can I aggregate the date into weeks or months as


The input looks like

ID datadate("YYYY-MM-DD")  value_for_day
--     -----                                -------
--     ------                               --------

and I want to be able to change it to

ID dataweek value_for_week


ID datamonth value_ for_ month

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